Seth Shostak: ET is (Probably) Out There -- Get Ready
Dr. Seth Shostak participates in the search for extraterrestrial life at the SETI Institute. He heads up the International Academy of Astronautics' SETI Committee, and hosts a weekly radio show, "Big Picture Science." Shostak has published more than 400 popular articles on science, and his most recent book is Confessions of an Alien Hunter, A Scientist's Search for Extraterrestrial Life (National Geographic). Shostak is also an accomplished photographer. His photos have been featured on the cover of Time magazine.
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Geoffrey West: The Surprising Math of Cities and Corporations
Physicist Geoffrey West has found that simple, mathematical laws govern the properties of cities -- that wealth, crime rate, walking speed and many other aspects of a city can be deduced from a single number: the city's population. In this mind-bending talk from TEDGlobal he shows how it works and how similar laws hold for organisms and corporations.
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James Hansen: Why I Must Speak Out About Climate Change
Top climate scientist James Hansen tells the story of his involvement in the science of and debate over global climate change. In doing so he outlines the overwhelming evidence that change is happening and why that makes him deeply worried about the future.